Excessive nitrogen addition accelerates N assimilation and P utilization by enhancing organic carbon decomposition in a Tibetan alpine steppe

Chen, Qiuyu; Yuan, Yunbin; Hu, Yilun; Wang, Jian; Si, Guicai; Xu, Ren‐Sheng; Zhou, Jizhong; Xi, Chuanwu; Hu, Ang; Zhang, Gengxin

doi:10.1016/j.scitotenv.2020.142848

Cited by 26 publications

(6 citation statements)

References 60 publications

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“…All C, N, and P cycling genes showed a consistent neutral response to N addition, which did not support our first hypothesis and was inconsistent with previous scholars’ results ( Zhang et al, 2019 ; Chen et al, 2020 ; Xiao et al, 2020 ). For example, N addition significantly increased the abundance of nitrifiers and denitrifiers in a meadow steppe ( Xiao et al, 2020 ) of C degradation genes in an alpine steppe ( Chen et al, 2020 ), whereas the neutral effects of N addition on the abundance of nifH and nirS have also been reported ( Sun et al, 2015 ). Zhang et al (2019) reported that N addition decreased the abundance of nifH , chiA , AOA , nirS , nirK , and nosZ .…”

Section: Discussioncontrasting

confidence: 99%

“…In a temperate steppe ecosystem, 5-year of N addition enhanced the abundance of the AOB gene by 11-fold and decreased the abundance of nifH , chiA , AOA , nirS , nirK , and nosZ genes by 30–50% ( Zhang et al, 2019 ). N addition (exceeding 40 kg N ha –1 year –1 ) notably enhanced the abundance of C degradation genes in an alpine steppe ( Chen et al, 2020 ). Similar to N addition, P addition can alter the structure of microbial functional genes ( Tan et al, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it has not been determined whether the alpine ecosystems on the QTP are limited by either N, P, or N and P. N and P inputs could affect ecosystem function significantly ( Jing et al, 2016 ). Elevated N deposition has significantly influenced soil properties and vegetation characteristics of QTP’s alpine grasslands ( Jiang et al, 2013 ; Ma et al, 2016 ; Li et al, 2019 ; Chen et al, 2020 ). P addition suppressed topsoil microbial activity and increased plant primary productivity in an alpine grassland ( Jing et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

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N Addition Overwhelmed the Effects of P Addition on the Soil C, N, and P Cycling Genes in Alpine Meadow of the Qinghai-Tibetan Plateau

et al. 2022

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Although human activities have greatly increased nitrogen (N) and phosphorus (P) inputs to the alpine grassland ecosystems, how soil microbial functional genes involved in nutrient cycling respond to N and P input remains unknown. Based on a fertilization experiment established in an alpine meadow of the Qinghai-Tibetan Plateau, we investigated the response of the abundance of soil carbon (C), N, and P cycling genes to N and P addition and evaluated soil and plant factors related to the observed effects. Our results indicated that the abundance of C, N, and P cycling genes were hardly affected by N addition, while P addition significantly increased most of them, suggesting that the availability of P plays a more important role for soil microorganisms than N in this alpine meadow ecosystem. Meanwhile, when N and P were added together, the abundance of C, N, and P cycling genes did not change significantly, indicating that the promoting effects of P addition on microbial functional genes abundances were overwhelmed by N addition. The Mantel analysis and the variation partitioning analysis revealed the major role of shoot P concentration in regulating the abundance of C, N, and P cycling genes. These results suggest that soil P availability and plant traits are key in governing C, N, and P cycling genes at the functional gene level in the alpine grassland ecosystem.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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N Addition Overwhelmed the Effects of P Addition on the Soil C, N, and P Cycling Genes in Alpine Meadow of the Qinghai-Tibetan Plateau

et al. 2022

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“…These results suggest that, adding to the observed organic C limitation, the local microbial metabolism is also N-limited. With excess electron acceptors in place at the seepage face, porewater N enrichment promotes a priming effect over organic matter mineralization by overcoming stoichiometric constraints of microbial metabolism (Guenet et al, 2010), thus accelerating organic C turnover within the seepage face as observed in other N-deficient systems (e.g., Mack et al, 2004;Bragazza et al, 2006;Chen et al, 2020).…”

Section: Mechanisms Underlying Nomentioning

confidence: 99%

“…On the other hand, fresh marine organic matter brought into the STE at the seepage face fuels a spatially heterogeneous cascade of biogeochemical processes that can determine final N loads to the coast (Ibánhez et al, 2013;Pain et al, 2019;Calvo-Martin et al, 2021). Due to the high mobility of N compounds in the environment and the role N plays in microbial and primary producer metabolism, anthropogenic N enrichment of STEs could also promote alterations on the cycling of other elements such as C. Hence, mobilization of organic C from high residence time reservoirs like peat bogs (Bragazza et al, 2006), the Artic tundra (Mack et al, 2004), or alpine steppes (Chen et al, 2020) is increasingly linked to the enhancement of microbial and enzymatic activity caused by anthropogenic N enrichment. Nevertheless, to our knowledge, the effect of N enrichment on the transformation of organic matter in STEs has only been explored to date in incubation experiments (Ibánhez and Rocha, 2014a).…”

Section: Introductionmentioning

confidence: 99%

Does Nitrate Enrichment Accelerate Organic Matter Turnover in Subterranean Estuaries?

2021

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Due to the widespread pollution of coastal groundwaters with fertilizers, submarine groundwater discharge (SGD) is often thought to be a large dissolved inorganic nitrogen (DIN) source to the ocean. Whether this N is autochthonous or allochthonous to the subterranean estuary (STE), the availability of large quantities of DIN can nevertheless interact with the cycling of other elements, such as carbon (C). In previous studies, we documented the discharge of large quantities of freshwater and NO3– from the mouth of an STE into the Ria Formosa lagoon (SW Iberian Peninsula). For the period covered in this study (2009–2011), the same STE site was dominated by recirculating seawater due to a prolonged fall in piezometric head in the coupled coastal aquifers. Total SGD rates remained similarly high, peaking at 144 cm day–1 at the lower intertidal during fall. We observed a progressive increase of NO3– availability within the STE associated with the recovery of piezometric head inland. Interestingly, during this period, the highest SGD-derived dissolved organic C and DIN fluxes (112 ± 53 and 10 ± 3 mmol m–2 day–1, respectively) originated in the lower intertidal. NO3– enrichment in the STE influences the benthic reactivity of fluorescent dissolved organic matter (FDOM): when seawater recirculation drives STE dynamics, only small changes in the benthic distribution of recalcitrant humic-like FDOM are observed (from −2.57 ± 1.14 to 1.24 ± 0.19 10–3 R.U. “bulk” sediment h–1) in the absence of DIN. However, when DIN is available, these recalcitrant fractions of FDOM are actively generated (from 1.32 ± 0.15 to 11.56 ± 3.39 10–3 R.U. “bulk” sediment h–1), accompanied by the production of labile protein-like FDOM. The results agree with previous studies conducted with flow-through reactor experiments at the same site and suggest that DIN enrichment in the STE enhances the metabolic turnover of sedimentary organic matter up to the point of discharge to surface waters. DIN pollution of coastal aquifers may therefore promote a contraction of the residence time of particulate organic C within the STE, driving carbon from continental storage into the sea.

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Responses of bacterial community composition and diversity to multi-level nitrogen addition at different periods of growing season driven by conditional rare taxa in an alpine meadow

Hu,

Ganjurjav,

et al. 2023

Biol Fertil Soils

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Excessive nitrogen addition accelerates N assimilation and P utilization by enhancing organic carbon decomposition in a Tibetan alpine steppe

Cited by 26 publications

References 60 publications

N Addition Overwhelmed the Effects of P Addition on the Soil C, N, and P Cycling Genes in Alpine Meadow of the Qinghai-Tibetan Plateau

N Addition Overwhelmed the Effects of P Addition on the Soil C, N, and P Cycling Genes in Alpine Meadow of the Qinghai-Tibetan Plateau

Does Nitrate Enrichment Accelerate Organic Matter Turnover in Subterranean Estuaries?

Responses of bacterial community composition and diversity to multi-level nitrogen addition at different periods of growing season driven by conditional rare taxa in an alpine meadow

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